/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Chat/SocialChatChannel.h
Manually adds the given message to the channel's log locally. Representations of this channel on other clients will not receive the message. Useful for adding custom messages that did not originate from a user.
virtual void InjectLocalMessage ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FSocialLocalChatMessage](API\Plugins\Party\Chat\FSocialLocalChatMessage) > & LocalMessage )